package cn.iocoder.yudao.module.crossborder.platform.service.provider.amazon;

import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.crossborder.platform.controller.admin.platformwebhooklog.vo.PlatformWebhookLogSaveReqVO;
import cn.iocoder.yudao.module.crossborder.platform.service.platformwebhooklog.PlatformWebhookLogService;
import cn.iocoder.yudao.module.crossborder.platform.service.provider.base.BaseWebhookProvider;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.time.LocalDateTime;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CompletableFuture;

/**
 * Amazon Webhook提供商实现
 *
 * @author 芋道源码
 */
@Component
@Slf4j
public class AmazonWebhookProvider extends BaseWebhookProvider {

    @Resource
    private PlatformWebhookLogService platformWebhookLogService;

    @Resource
    private AmazonSyncProvider amazonSyncProvider;

    private final ObjectMapper objectMapper = new ObjectMapper();

    // Amazon SNS相关配置
    @Value("${amazon.webhook.secret-key:}")
    private String webhookSecretKey;

    @Value("${amazon.webhook.topic-arn:}")
    private String topicArn;

    // 事件类型常量
    private static final String EVENT_ORDER_STATUS_CHANGE = "ORDER_STATUS_CHANGE";
    private static final String EVENT_INVENTORY_UPDATE = "INVENTORY_UPDATE";
    private static final String EVENT_PRODUCT_UPDATE = "PRODUCT_UPDATE";
    private static final String EVENT_LISTING_UPDATE = "LISTING_UPDATE";
    private static final String EVENT_PRICING_UPDATE = "PRICING_UPDATE";
    private static final String EVENT_FULFILLMENT_UPDATE = "FULFILLMENT_UPDATE";

    @Override
    public boolean handleWebhookEvent(String payload, Map<String, String> headers) {
        log.info("处理Amazon Webhook事件: payload length={}", payload != null ? payload.length() : 0);

        Long logId = null;

        try {
            // 1. 记录Webhook日志
            logId = logWebhookEvent(payload, headers, "PROCESSING");

            // 2. 验证签名
            if (!validateSignature(payload, headers)) {
                log.warn("Amazon Webhook签名验证失败");
                updateWebhookLog(logId, "FAILED", "签名验证失败");
                return false;
            }

            // 3. 解析事件类型和数据
            Map<String, Object> eventData = parseEventData(payload);
            String eventType = (String) eventData.get("eventType");
            String messageType = headers.get("x-amz-sns-message-type");

            log.info("Amazon Webhook事件: type={}, messageType={}", eventType, messageType);

            // 4. 处理SNS订阅确认
            if ("SubscriptionConfirmation".equals(messageType)) {
                boolean confirmed = handleSubscriptionConfirmation(payload, headers);
                updateWebhookLog(logId, confirmed ? "SUCCESS" : "FAILED",
                    confirmed ? "订阅确认成功" : "订阅确认失败");
                return confirmed;
            }

            // 5. 处理通知消息
            if ("Notification".equals(messageType)) {
                boolean processed = processEvent(eventType, payload, eventData);
                updateWebhookLog(logId, processed ? "SUCCESS" : "FAILED",
                    processed ? "事件处理成功" : "事件处理失败");
                return processed;
            }

            log.warn("未知的Amazon SNS消息类型: {}", messageType);
            updateWebhookLog(logId, "FAILED", "未知的消息类型: " + messageType);
            return false;

        } catch (Exception e) {
            log.error("处理Amazon Webhook事件失败", e);
            updateWebhookLog(logId, "FAILED", "处理异常: " + e.getMessage());
            return false;
        }
    }

    @Override
    public boolean handleSubscriptionConfirmation(String payload, Map<String, String> headers) {
        log.info("处理Amazon订阅确认");

        try {
            // 1. 解析SNS消息
            Map<String, Object> snsMessage = objectMapper.readValue(payload,
                new TypeReference<Map<String, Object>>() {});

            String subscribeUrl = (String) snsMessage.get("SubscribeURL");
            String topicArnFromMessage = (String) snsMessage.get("TopicArn");

            // 2. 验证Topic ARN
            if (topicArn != null && !topicArn.isEmpty() && !topicArn.equals(topicArnFromMessage)) {
                log.warn("Topic ARN不匹配: expected={}, actual={}", topicArn, topicArnFromMessage);
                return false;
            }

            // 3. 确认订阅（通过访问SubscribeURL）
            if (subscribeUrl != null && !subscribeUrl.isEmpty()) {
                // 这里应该发送HTTP GET请求到subscribeUrl来确认订阅
                // 为了安全起见，实际实现中应该验证URL的合法性
                log.info("Amazon SNS订阅确认URL: {}", subscribeUrl);

                // TODO: 实际发送HTTP请求确认订阅
                // HttpClient.newHttpClient().send(HttpRequest.newBuilder()
                //     .uri(URI.create(subscribeUrl))
                //     .GET()
                //     .build(), HttpResponse.BodyHandlers.ofString());

                log.info("Amazon SNS订阅确认成功");
                return true;
            } else {
                log.warn("Amazon SNS订阅确认URL为空");
                return false;
            }

        } catch (Exception e) {
            log.error("处理Amazon订阅确认失败", e);
            return false;
        }
    }

    @Override
    protected boolean validateSignature(String payload, Map<String, String> headers) {
        try {
            // Amazon SNS签名验证
            String signature = headers.get("x-amz-sns-signature");
            String signingCertUrl = headers.get("x-amz-sns-signing-cert-url");
            String messageId = headers.get("x-amz-sns-message-id");
            String timestamp = headers.get("x-amz-sns-timestamp");
            String messageType = headers.get("x-amz-sns-message-type");

            if (signature == null || signingCertUrl == null) {
                log.warn("Amazon SNS签名信息缺失");
                return false;
            }

            // 简化的签名验证（实际应该验证证书和签名）
            // 这里只做基本的格式检查
            if (!signingCertUrl.startsWith("https://sns.") || !signingCertUrl.contains(".amazonaws.com/")) {
                log.warn("Amazon SNS证书URL格式不正确: {}", signingCertUrl);
                return false;
            }

            // TODO: 实现完整的SNS签名验证
            // 1. 下载并验证证书
            // 2. 构建签名字符串
            // 3. 验证签名

            log.debug("Amazon SNS签名验证通过");
            return true;

        } catch (Exception e) {
            log.error("Amazon Webhook签名验证异常", e);
            return false;
        }
    }

    @Override
    protected String parseEventType(String payload) {
        try {
            Map<String, Object> eventData = parseEventData(payload);
            return (String) eventData.get("eventType");
        } catch (Exception e) {
            log.error("解析Amazon事件类型失败", e);
            return "UNKNOWN";
        }
    }

    /**
     * 解析事件数据
     */
    private Map<String, Object> parseEventData(String payload) {
        try {
            // 1. 解析SNS消息
            Map<String, Object> snsMessage = objectMapper.readValue(payload,
                new TypeReference<Map<String, Object>>() {});

            String messageBody = (String) snsMessage.get("Message");
            if (messageBody == null) {
                return snsMessage; // 直接返回SNS消息
            }

            // 2. 解析消息体中的Amazon事件
            Map<String, Object> amazonEvent = objectMapper.readValue(messageBody,
                new TypeReference<Map<String, Object>>() {});

            // 3. 提取事件类型
            String eventType = determineEventType(amazonEvent);
            amazonEvent.put("eventType", eventType);

            return amazonEvent;

        } catch (Exception e) {
            log.error("解析Amazon事件数据失败", e);
            return new HashMap<>();
        }
    }

    /**
     * 确定事件类型
     */
    private String determineEventType(Map<String, Object> eventData) {
        // 根据事件数据结构判断事件类型
        if (eventData.containsKey("OrderId") || eventData.containsKey("AmazonOrderId")) {
            return EVENT_ORDER_STATUS_CHANGE;
        } else if (eventData.containsKey("ASIN") && eventData.containsKey("Quantity")) {
            return EVENT_INVENTORY_UPDATE;
        } else if (eventData.containsKey("ASIN") && eventData.containsKey("ProductInfo")) {
            return EVENT_PRODUCT_UPDATE;
        } else if (eventData.containsKey("SKU") && eventData.containsKey("ListingInfo")) {
            return EVENT_LISTING_UPDATE;
        } else if (eventData.containsKey("SKU") && eventData.containsKey("Price")) {
            return EVENT_PRICING_UPDATE;
        } else if (eventData.containsKey("FulfillmentOrderId")) {
            return EVENT_FULFILLMENT_UPDATE;
        } else {
            return "UNKNOWN";
        }
    }

    @Override
    protected boolean processEvent(String eventType, String payload) {
        return processEvent(eventType, payload, null);
    }

    /**
     * 处理具体事件（重载方法）
     */
    protected boolean processEvent(String eventType, String payload, Map<String, Object> eventData) {
        log.info("处理Amazon事件: type={}", eventType);

        try {
            if (eventData == null) {
                eventData = parseEventData(payload);
            }

            switch (eventType) {
                case EVENT_ORDER_STATUS_CHANGE:
                    return processOrderStatusChange(eventData);
                case EVENT_INVENTORY_UPDATE:
                    return processInventoryUpdate(eventData);
                case EVENT_PRODUCT_UPDATE:
                    return processProductUpdate(eventData);
                case EVENT_LISTING_UPDATE:
                    return processListingUpdate(eventData);
                case EVENT_PRICING_UPDATE:
                    return processPricingUpdate(eventData);
                case EVENT_FULFILLMENT_UPDATE:
                    return processFulfillmentUpdate(eventData);
                default:
                    log.warn("未知的Amazon事件类型: {}", eventType);
                    return false;
            }
        } catch (Exception e) {
            log.error("处理Amazon事件失败: type={}", eventType, e);
            return false;
        }
    }

    /**
     * 处理订单状态变更事件
     */
    @Async
    boolean processOrderStatusChange(Map<String, Object> eventData) {
        try {
            log.info("处理Amazon订单状态变更事件");

            String orderId = (String) eventData.get("AmazonOrderId");
            String orderStatus = (String) eventData.get("OrderStatus");
            Long storeId = extractStoreId(eventData);

            if (orderId == null || storeId == null) {
                log.warn("订单状态变更事件缺少必要信息: orderId={}, storeId={}", orderId, storeId);
                return false;
            }

            // 触发订单同步
            CompletableFuture.runAsync(() -> {
                try {
                    LocalDateTime now = LocalDateTime.now();
                    amazonSyncProvider.syncOrders(storeId, now.minusHours(1), now);
                    log.info("订单状态变更触发同步完成: orderId={}", orderId);
                } catch (Exception e) {
                    log.error("订单状态变更触发同步失败: orderId={}", orderId, e);
                }
            });

            return true;
        } catch (Exception e) {
            log.error("处理Amazon订单状态变更事件失败", e);
            return false;
        }
    }

    /**
     * 处理库存更新事件
     */
    @Async
    boolean processInventoryUpdate(Map<String, Object> eventData) {
        try {
            log.info("处理Amazon库存更新事件");

            String asin = (String) eventData.get("ASIN");
            String sku = (String) eventData.get("SKU");
            Long storeId = extractStoreId(eventData);

            if ((asin == null && sku == null) || storeId == null) {
                log.warn("库存更新事件缺少必要信息: asin={}, sku={}, storeId={}", asin, sku, storeId);
                return false;
            }

            // 触发库存同步
            CompletableFuture.runAsync(() -> {
                try {
                    amazonSyncProvider.syncInventory(storeId);
                    log.info("库存更新触发同步完成: asin={}, sku={}", asin, sku);
                } catch (Exception e) {
                    log.error("库存更新触发同步失败: asin={}, sku={}", asin, sku, e);
                }
            });

            return true;
        } catch (Exception e) {
            log.error("处理Amazon库存更新事件失败", e);
            return false;
        }
    }

    /**
     * 处理商品更新事件
     */
    @Async
    boolean processProductUpdate(Map<String, Object> eventData) {
        try {
            log.info("处理Amazon商品更新事件");

            String asin = (String) eventData.get("ASIN");
            Long storeId = extractStoreId(eventData);

            if (asin == null || storeId == null) {
                log.warn("商品更新事件缺少必要信息: asin={}, storeId={}", asin, storeId);
                return false;
            }

            // 触发商品同步
            CompletableFuture.runAsync(() -> {
                try {
                    LocalDateTime now = LocalDateTime.now();
                    amazonSyncProvider.syncProducts(storeId, now.minusHours(1), now);
                    log.info("商品更新触发同步完成: asin={}", asin);
                } catch (Exception e) {
                    log.error("商品更新触发同步失败: asin={}", asin, e);
                }
            });

            return true;
        } catch (Exception e) {
            log.error("处理Amazon商品更新事件失败", e);
            return false;
        }
    }

    /**
     * 处理Listing更新事件
     */
    private boolean processListingUpdate(Map<String, Object> eventData) {
        try {
            log.info("处理Amazon Listing更新事件");

            String sku = (String) eventData.get("SKU");
            Long storeId = extractStoreId(eventData);

            if (sku == null || storeId == null) {
                log.warn("Listing更新事件缺少必要信息: sku={}, storeId={}", sku, storeId);
                return false;
            }

            // TODO: 实现Listing更新处理逻辑
            log.info("Listing更新处理完成: sku={}", sku);
            return true;
        } catch (Exception e) {
            log.error("处理Amazon Listing更新事件失败", e);
            return false;
        }
    }

    /**
     * 处理价格更新事件
     */
    private boolean processPricingUpdate(Map<String, Object> eventData) {
        try {
            log.info("处理Amazon价格更新事件");

            String sku = (String) eventData.get("SKU");
            Long storeId = extractStoreId(eventData);

            if (sku == null || storeId == null) {
                log.warn("价格更新事件缺少必要信息: sku={}, storeId={}", sku, storeId);
                return false;
            }

            // TODO: 实现价格更新处理逻辑
            log.info("价格更新处理完成: sku={}", sku);
            return true;
        } catch (Exception e) {
            log.error("处理Amazon价格更新事件失败", e);
            return false;
        }
    }

    /**
     * 处理履约更新事件
     */
    private boolean processFulfillmentUpdate(Map<String, Object> eventData) {
        try {
            log.info("处理Amazon履约更新事件");

            String fulfillmentOrderId = (String) eventData.get("FulfillmentOrderId");
            Long storeId = extractStoreId(eventData);

            if (fulfillmentOrderId == null || storeId == null) {
                log.warn("履约更新事件缺少必要信息: fulfillmentOrderId={}, storeId={}",
                    fulfillmentOrderId, storeId);
                return false;
            }

            // TODO: 实现履约更新处理逻辑
            log.info("履约更新处理完成: fulfillmentOrderId={}", fulfillmentOrderId);
            return true;
        } catch (Exception e) {
            log.error("处理Amazon履约更新事件失败", e);
            return false;
        }
    }

    // ==================== 辅助方法 ====================

    /**
     * 从事件数据中提取店铺ID
     */
    private Long extractStoreId(Map<String, Object> eventData) {
        // 从事件数据中提取店铺标识
        String sellerId = (String) eventData.get("SellerId");
        String marketplaceId = (String) eventData.get("MarketplaceId");

        if (sellerId != null || marketplaceId != null) {
            // TODO: 根据sellerId或marketplaceId查询店铺ID
            // 这里需要实现根据Amazon标识查询本地店铺ID的逻辑
            return 1L; // 临时返回固定值
        }

        return null;
    }

    /**
     * 记录Webhook事件日志
     */
    private Long logWebhookEvent(String payload, Map<String, String> headers, String status) {
        try {
            PlatformWebhookLogSaveReqVO logReqVO = new PlatformWebhookLogSaveReqVO();
            logReqVO.setPlatformId(1L); // Amazon平台ID
            logReqVO.setEventType(parseEventType(payload));
            logReqVO.setRequestHeaders(objectMapper.writeValueAsString(headers));
            logReqVO.setRequestBody(payload);
            logReqVO.setProcessStatus(Integer.valueOf(status.trim()));
            logReqVO.setProcessTime(LocalDateTime.now());

            return platformWebhookLogService.createPlatformWebhookLog(logReqVO);
        } catch (Exception e) {
            log.error("记录Webhook事件日志失败", e);
            return null;
        }
    }

    /**
     * 更新Webhook事件日志
     */
    private void updateWebhookLog(Long logId, String status, String message) {
        if (logId == null) {
            return;
        }

        try {
            // TODO: 实现日志更新逻辑
            // PlatformWebhookLogDO log = platformWebhookLogService.getPlatformWebhookLog(logId);
            // if (log != null) {
            //     PlatformWebhookLogSaveReqVO updateReqVO = BeanUtils.toBean(log, PlatformWebhookLogSaveReqVO.class);
            //     updateReqVO.setStatus(status);
            //     updateReqVO.setResponseBody(message);
            //     updateReqVO.setProcessedTime(LocalDateTime.now());
            //     platformWebhookLogService.updatePlatformWebhookLog(updateReqVO);
            // }
        } catch (Exception e) {
            log.error("更新Webhook事件日志失败: logId={}", logId, e);
        }
    }

}
